How to Set Up AWS Billing Alerts and Budget Alarms

What Are AWS Billing Alerts and Budget Alarms?

AWS Billing Alerts notify you when your estimated AWS charges cross a defined threshold. They are created through Amazon CloudWatch after billing alerts are enabled in the AWS Billing and Cost Management console.

AWS Budget Alerts are notifications configured within AWS Budgets when your actual or forecasted spending reaches a defined budget threshold. You can set alerts based on a percentage or monetary amount and configure different thresholds for early warnings and critical spending levels. 

The two mechanisms serve different purposes:

How to Set Up an AWS Billing Alert

Before creating a CloudWatch billing alarm, you must enable monitoring of estimated AWS charges. AWS stores billing metric data in the US East (N. Virginia) Region and uses it to represent worldwide charges.

Step 1: Enable Billing Alerts

1. Open the AWS Billing and Cost Management console.
2. Go to Billing Preferences.
3. Under Alert preferences, choose Edit.
4. Select Receive CloudWatch Billing Alerts.
5. Save your preferences.

After billing alerts are enabled for the first time, it can take approximately 15 minutes before billing data becomes available for CloudWatch alarms.

Step 2: Create a CloudWatch Billing Alarm

1. Open Amazon CloudWatch.
2. Select Alarms and choose Create alarm.
3. Select Select metric.
4. Choose Billing → Total Estimated Charge.
5. Select the Estimated Charges metric.
6. Set the statistic to Maximum and the period to 6 hours.
7. Choose a Static threshold and enter the amount that should trigger the alarm.
8. Configure an Amazon SNS topic for notifications.
9. Add an alarm name and review the configuration.
10. Choose Create alarm.

The alarm triggers when current estimated charges exceed the threshold. It does not forecast where spending will end up for the month.

How to Set Up an AWS Budget Alert

AWS Budgets is useful when you want more control over how spending is monitored. You can create cost budgets for different periods and configure alerts based on actual or forecasted spending.

Step 1: Create a Cost Budget

1. Open the AWS Billing and Cost Management console.
2. Select Budgets.
3. Choose Create budget.
4. Select Cost budget.
5. Enter a budget name and choose the budget period.
6. Set your budget amount.
7. Add filters if you want to monitor specific services, accounts, or other supported dimensions.

For broader spending analysis, AWS Cost Explorer can help you examine historical costs, usage trends, and forecasts alongside your budget data.

Step 2: Configure Budget Alerts

Add an alert threshold based on either an absolute amount or a percentage of the budget. You can configure the alert against actual spending or forecasted spending.

For example, if your monthly budget is $1,000, you could configure alerts at 80% and 100% of the budget. AWS Budgets supports notifications through email or Amazon SNS.

AWS Billing Alerts vs. AWS Budgets: Which Should You Use?

Use CloudWatch billing alarms when you need a straightforward alert based on total estimated AWS charges.

Use AWS Budgets when you need more detailed cost monitoring, flexible thresholds, actual or forecasted alerts, or budget-based actions.

For example:

• Small AWS account: A CloudWatch billing alarm can provide a simple spending safeguard.
• Growing workload: AWS Budgets can track spending against a defined monthly target.
• Multiple teams or services: Budgets can provide more granular monitoring through supported filters.
• Proactive cost control: Budgets can trigger supported actions when thresholds are exceeded.

AWS Budgets can also track Reserved Instances and Savings Plans utilization and coverage, making it useful for broader cloud financial management.

For a broader overview, see AWS Cost Management: Optimize & Reduce Cloud Spend.

Best Practices for AWS Billing Alerts and Budget Alarms

To get more value from AWS cost alerts:

• Set multiple thresholds: Use early-warning and critical thresholds rather than relying on a single alert.
• Use forecasted alerts: Where sufficient historical data is available, forecast alerts can provide earlier warning of potential overspending.
• Send alerts to the right people: Use email or Amazon SNS to notify the teams responsible for cloud costs.
• Review thresholds regularly: Update budgets as workloads, business requirements, and spending patterns change.
• Combine alerts with cost visibility: Use cloud cost visibility and usage analysis to understand why spending changed instead of treating alerts as the complete solution.

Avoid relying exclusively on alerts: Billing and budget data can have delays, so alerts should be part of a broader cloud cost management process.

A mature cloud cost optimization strategy combines alerts and guardrails with continuous analysis and optimization rather than waiting for a monthly bill.

For practical strategies, see AWS Cost Optimization Strategies for DevOps.

How Do AWS Billing Alerts Help Prevent Cost Overruns?

Billing alerts provide an early warning when AWS spending reaches a defined threshold, while budget alerts help teams monitor spending against planned limits.

However, an alert tells you that spending has changed; it does not necessarily explain why. When an unexpected increase occurs, AWS Cost Anomaly Detection can help identify unusual spending patterns and provide another layer of proactive monitoring.

Combining budget thresholds, anomaly detection, and cloud cost monitoring gives teams a more complete view of AWS spending.

Conclusion

AWS billing alerts and budget alarms provide useful safeguards against unexpected cloud spending. CloudWatch billing alarms are well suited to simple threshold notifications, while AWS Budgets provides more flexible monitoring through spending targets, forecasts, filters, and budget actions.

As AWS environments grow, alerts work best as part of a broader approach to cost visibility, anomaly detection, forecasting, and optimization. CloudKeeper can complement native AWS cost controls with deeper visibility, proactive recommendations, and monitoring across cloud accounts and workloads.

Frequently Asked Questions

• What is the difference between AWS Billing Alerts and AWS Budgets?

  AWS Billing Alerts use CloudWatch to notify you when estimated AWS charges cross a defined threshold. AWS Budgets provides broader cost and usage monitoring with actual or forecasted alerts, filters, and optional budget actions.

• Can AWS Budgets send email alerts?

  Yes. AWS Budgets can send notifications to email addresses and Amazon SNS topics.

• Do AWS billing alarms forecast future spending?

  No. A CloudWatch billing alarm triggers when current estimated charges exceed the configured threshold. It does not project the final monthly bill based on spending trends. For forecasting and historical trend analysis, cloud forecasting and AWS Cost Explorer provide more relevant capabilities.

• Can AWS Budgets automatically stop resources?

  AWS Budgets supports budget actions that can apply IAM policies, service control policies, or target supported EC2 and RDS resources when configured appropriately. These actions require the necessary permissions and configuration. AWS IAM controls the permissions required for these actions.

• How often does AWS Budgets update?

  AWS states that budget information is updated up to three times a day, and there can be a delay between when usage occurs and when a budget notification is delivered.

• What is the best way to monitor AWS costs?

  AWS Budgets and CloudWatch billing alarms provide useful native safeguards, while AWS Cost Explorer helps analyze spending and trends. For broader cost management, teams can combine these tools with AWS cost optimization practices and continuous cost monitoring.